Three of the following four number pairs are alike in a certain way and one is different. Pick the odd one out.
Answer & explanation
Correct answer: option 3
78 : 127 = 127 - 78 = 49 (it is perfect square of 7)
61 : 97 = 97 - 61 = 36 (it is perfect square of 6)
56 : 136 = 136 - 56 = 80 (it is not perfect square ) Odd
25 : 89 = 89 - 25 = 64 (it is perfect square of 8)